Because they knew full well that the bulk of the confiscated weapons never came from the United States!I don't see why we should care how many weapons couldn't be traced back to America even though they came across the border, because it's a moot point. The identifying marks don't exist on them if they can't be traced, meaning the whole thing is a non-issue for everybody except those who have an axe to grind and rights to try and destroy.
Label: Non-Sarcastic